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Controlling Multiple Buck Converters With Same Frequencies

Example 3-2. Code Snippet for Configuration in

Figure 3-5

//=====================================================================
// Config
//=====================================================================
// Initialization Time
//========================
// EPWM Module 1 config

EPwm1Regs.TBPRD = 600;

// Period = 1200 TBCLK counts

EPwm1Regs.TBPHS = 0;

// Set Phase register to zero

EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetrical mode
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;

// Master module

EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO;

// Sync down-stream module

EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;

// load on CTR=Zero

EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

// load on CTR=Zero

EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;

// set actions for EPWM1A

EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;
EPwm1Regs.AQCTLB.bit.CBU = AQ_SET;

// set actions for EPWM1B

EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR;

// EPWM Module 2 config

EPwm2Regs.TBPRD = 600;

// Period = 1200 TBCLK counts

EPwm2Regs.TBPHS = 0;

// Set Phase register to zero

EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetrical mode
EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE;

// Slave module

EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN;

// sync flow-through

EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;

// load on CTR=Zero

EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

// load on CTR=Zero

EPwm2Regs.AQCTLA.bit.CAU = AQ_SET;

// set actions for EPWM2A

EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;
EPwm2Regs.AQCTLB.bit.CBU = AQ_SET;

// set actions for EPWM2B

EPwm2Regs.AQCTLB.bit.CBD = AQ_CLEAR;

//
// Run Time (Note: Example execution of one run-time instance)
//===========================================================

EPwm1Regs.CMPA.half.CMPA = 400;

// adjust duty for output EPWM1A

EPwm1Regs.CMPB = 200;

// adjust duty for output EPWM1B

EPwm2Regs.CMPA.half.CMPA = 500;

// adjust duty for output EPWM2A

EPwm2Regs.CMPB = 300;

// adjust duty for output EPWM2B

SPRU791D – November 2004 – Revised October 2007

Applications to Power Topologies

77

Submit Documentation Feedback

Summary of Contents for 28xxx

Page 1: ...TMS320x28xx 28xxx Enhanced Pulse Width Modulator ePWM Module Reference Guide Literature Number SPRU791D November 2004 Revised October 2007...

Page 2: ...2 SPRU791D November 2004 Revised October 2007 Submit Documentation Feedback...

Page 3: ...alifier Event Priority 40 2 4 4 Waveforms for Common Configurations 41 2 5 Dead Band Generator DB Submodule 50 2 5 1 Purpose of the Dead Band Submodule 50 2 5 2 Controlling and Monitoring the Dead Ban...

Page 4: ...ero Voltage Switched Full Bridge ZVSFB Converter 89 4 Registers 93 4 1 Time Base Submodule Registers 94 4 2 Counter Compare Submodule Registers 97 4 3 Action Qualifier Submodule Registers 99 4 4 Dead...

Page 5: ...endent Modulation on EPWMxA and EPWMxB Active High 43 2 22 Up Single Edge Asymmetric Waveform With Independent Modulation on EPWMxA and EPWMxB Active Low 44 2 23 Up Count Pulse Placement Asymmetric Wa...

Page 6: ...BPHS 94 4 3 Time Base Counter Register TBCTR 94 4 4 Time Base Control Register TBCTL 95 4 5 Time Base Status Register TBSTS 97 4 6 Counter Compare A Register CMPA 97 4 7 Counter Compare B Register CMP...

Page 7: ...ounter Compare B Register CMPB Field Descriptions 98 4 8 Counter Compare Control Register CMPCTL Field Descriptions 99 4 9 Action Qualifier Output A Control Register AQCTLA Field Descriptions 100 4 10...

Page 8: ...List of Tables 8 SPRU791D November 2004 Revised October 2007 Submit Documentation Feedback...

Page 9: ...ital signal processors DSPs It also describes emulation features available on these DSPs SPRU712 TMS320x280x 2801x 2804x System Control and Interrupts Reference Guide describes the various interrupts...

Page 10: ...rmation is located within that memory Tools Guides SPRU513 TMS320C28x Assembly Language Tools User s Guide describes the assembly language tools assembler and other tools used to develop assembly lang...

Page 11: ...0 5 This application report has an option to download an example program that executes from RAM on the F2808 EzDSP SPRAAI1 Using Enhanced Pulse Width Modulator ePWM Module for 0 100 Duty Cycle Control...

Page 12: ...Read This First 12 SPRU791D November 2004 Revised October 2007 Submit Documentation Feedback...

Page 13: ...and other forms of power conversion The ePWM peripheral performs a digital to analog DAC function where the duty cycle is equivalent to a DAC analog value it is sometimes referred to as a Power DAC T...

Page 14: ...feature Each ePWM module is indicated by a numerical value starting with 1 For example ePWM1 is the first instance and ePWM3 is the 3rd instance in the system and ePWMx indicates any instance The ePW...

Page 15: ...WMxSOC To eCAP1 Submodule Overview Figure 1 1 Multiple ePWM Modules The order in which the ePWM modules are connected may differ from what is shown in Figure 1 1 See Section 2 2 3 2 for the synchroniz...

Page 16: ...trip zone signals The trip zone signals can be configured as asynchronous inputs through the GPIO peripheral Time base synchronization input EPWMxSYNCI and output EPWMxSYNCO signals The synchronizati...

Page 17: ...R_Dir CTR ZERO CTR CMPA CTR CMPB 16 16 16 16 16 16 Phase control EPWMxTZINT CTR ZERO 1 3 Register Mapping Register Mapping Figure 1 3 ePWM Submodules and Critical Internal Signal Interconnects Figure...

Page 18: ...Edge Delay Count Register Trip Zone Submodule Registers TZSEL 0x0012 1 No Trip Zone Select Register TZCTL 0x0014 1 No Trip Zone Control Register 3 TZEINT 0x0015 1 No Trip Zone Enable Interrupt Regist...

Page 19: ...e configured by software Topic Page 2 1 Overview 20 2 2 Time Base TB Submodule 23 2 3 Counter Compare CC Submodule 32 2 4 Action Qualifier AQ Submodule 37 2 5 Dead Band Generator DB Submodule 50 2 6 P...

Page 20: ...itching events occur on the EPWMxA or EPWMxB output Action qualifier AQ Specify the type of action taken when a time base or counter compare submodule event occurs No action taken Output EPWMxA and or...

Page 21: ...define TB_FREEZE 0x3 PHSEN bit define TB_DISABLE 0x0 define TB_ENABLE 0x1 PRDLD bit define TB_SHADOW 0x0 define TB_IMMEDIATE 0x1 SYNCOSEL bits define TB_SYNC_IN 0x0 define TB_CTR_ZERO 0x1 define TB_C...

Page 22: ...define CHP6_8TH 0x5 define CHP7_8TH 0x6 TZSEL Trip zone Select CBCn and OSHTn bits define TZ_ENABLE 0x0 define TZ_DISABLE 0x1 TZCTL Trip zone Control TZA and TZB bits define TZ_HIZ 0x0 define TZ_FORCE...

Page 23: ...2 1 illustrates the time base module s place within the ePWM Figure 2 1 Time Base Submodule Block Diagram You can configure the time base submodule for the following Specify the ePWM time base counte...

Page 24: ...Status Register TBPHSHR 0x0002 No HRPWM extension Phase Register 1 TBPHS 0x0003 No Time Base Phase Register TBCTR 0x0004 No Time Base Counter Register TBPRD 0x0005 Yes Time Base Period Register 1 Thi...

Page 25: ...M s time base counter This signal is high when the counter is increasing and low when it is decreasing CTR_max Time base counter equal max value TBCTR 0xFFFF Generated event when the TBCTR value reach...

Page 26: ...rol hardware At a strategic point in time the shadow register s content is transferred to the active register This prevents corruption or spurious operation due to the register being asynchronously mo...

Page 27: ...tion output EPWMxSYNCO The input synchronization for the first instance ePWM1 comes from an external pin The possible synchronization connections for the remaining ePWM modules are shown in Figure 2 4...

Page 28: ...5 EPWM15SYNCO EPWM8SYNCI ePWM8 EPWM8SYNCO EPWM12SYNCI ePWM12 EPWM12SYNCO EPWM16SYNCI ePWM16 EPWM16SYNCO SYNCI eCAP1 Time Base TB Submodule Scheme 2 shown in Figure 2 5 is used by the 2804x devices whe...

Page 29: ...and therefore has the same effect as a pulse on EPWMxSYNCI This feature enables the ePWM module to be automatically synchronized to the time base of another ePWM module Lead or lag phase control can b...

Page 30: ...of each ePWM module must be set identically The proper procedure for enabling the ePWM clocks is as follows 1 Enable the individual ePWM module clocks This is described in the specific device version...

Page 31: ...WN UP DOWN UP TBPHS value TBPRD value EPWMxSYNCI CTR_dir CTR zero CNT_max CTR PRD Time Base TB Submodule Figure 2 8 Time Base Down Count Mode Waveforms Figure 2 9 Time Base Up Down Count Waveforms TBC...

Page 32: ...Time Base TB CTR PRD CTR 0 CTR_Dir EPWMxSYNCI EPWMxSYNCO EPWMxTZINT PWM chopper PC Event Trigger and Interrupt ET Trip Zone TZ GPIO MUX ADC PIE PIE Counter Compare CC Submodule Figure 2 10 Time Base...

Page 33: ...er compare A register TBCTR CMPA CTR CMPB Time base counter equals counter compare B register TBCTR CMPB Controls the PWM duty cycle if the action qualifier submodule is configured appropriately Shado...

Page 34: ...to the registers synchronized with the hardware When shadowing is used updates to the active registers only occurs at strategic points This prevents corruption or spurious operation due to the regist...

Page 35: ...the timing diagrams in Figure 2 13 through Figure 2 16 show when events are generated and how the EPWMxSYNCI signal interacts Figure 2 13 Counter Compare Event Waveforms in Up Count Mode NOTE An EPWMx...

Page 36: ...RD value CTR CMPA CTR CMPB EPWMxSYNCI Counter Compare CC Submodule Figure 2 15 Counter Compare Events In Up Down Count Mode TBCTL PHSDIR 0 Count Down On Synchronization Event Figure 2 16 Counter Compa...

Page 37: ...qualifier submodule is responsible for the following Qualifying and generating actions set clear toggle based on the following events CTR PRD Time base counter equal to the period TBCTR TBPRD CTR Zero...

Page 38: ...compare B TBCTR CMPB Software forced event Asynchronous event initiated by software The software forced action is a useful asynchronous event This control is handled by registers AQSFRC and AQCSFRC T...

Page 39: ...ontrol registers found at the end of this section For clarity the drawings in this document use a set of symbolic actions These symbols are summarized in Figure 2 19 Each symbol represents an action a...

Page 40: ...r equals CMPA on up count CBU 1 1 To maintain symmetry for up down count mode both up events CAU CBU and down events CAD CBD can be generated for TBPRD Otherwise up events can occur only when the coun...

Page 41: ...ng Use up down count mode to generate a symmetric PWM If you load CMPA CMPB on zero then use CMPA CMPB values greater than or equal to 1 If you load CMPA CMPB on period then use CMPA CMPB values less...

Page 42: ...M period which when very short tend to be ignored by the system Figure 2 20 Up Down Count Mode Symmetrical Waveform The PWM waveforms in Figure 2 21 through Figure 2 26 show some common action qualifi...

Page 43: ...Initialization Time EPwm1Regs TBPRD 600 Period 601 TBCLK counts EPwm1Regs CMPA half CMPA 350 Compare A 350 TBCLK counts EPwm1Regs CMPB 200 Compare B 200 TBCLK counts EPwm1Regs TBPHS 0 Set Phase regis...

Page 44: ...modulation for EPWMxB is set by CMPB and is active low that is the low time duty is proportional to CMPB D The Do Nothing actions X are shown for completeness here but will not be shown on subsequent...

Page 45: ...TL bit LOADAMODE CC_CTR_ZERO load on TBCTR Zero EPwm1Regs CMPCTL bit LOADBMODE CC_CTR_ZERO load on TBCTR Zero EPwm1Regs AQCTLA bit PRD AQ_CLEAR EPwm1Regs AQCTLA bit CAU AQ_SET EPwm1Regs AQCTLB bit PRD...

Page 46: ...TB_SHADOW EPwm1Regs TBCTL bit SYNCOSEL TB_SYNC_DISABLE EPwm1Regs TBCTL bit HSPCLKDIV TB_DIV1 TBCLK SYSCLKOUT EPwm1Regs TBCTL bit CLKDIV TB_DIV1 EPwm1Regs CMPCTL bit SHDWAMODE CC_SHADOW EPwm1Regs CMPC...

Page 47: ...CMPA half CMPA 400 Compare A 400 TBCLK counts EPwm1Regs CMPB 500 Compare B 500 TBCLK counts EPwm1Regs TBPHS 0 Set Phase register to zero EPwm1Regs TBCNT 0 clear TB counter EPwm1Regs TBCTL bit CTRMODE...

Page 48: ...itialization Time EPwm1Regs TBPRD 600 Period 2 600 TBCLK counts EPwm1Regs CMPA half CMPA 350 Compare A 350 TBCLK counts EPwm1Regs CMPB 400 Compare B 400 TBCLK counts EPwm1Regs TBPHS 0 Set Phase regist...

Page 49: ...zation Time EPwm1Regs TBPRD 600 Period 2 600 TBCLK counts EPwm1Regs CMPA half CMPA 250 Compare A 250 TBCLK counts EPwm1Regs CMPB 450 Compare B 450 TBCLK counts EPwm1Regs TBPHS 0 Set Phase register to...

Page 50: ...if the more classical edge delay based dead band with polarity control is required then the dead band submodule described here should be used The key functions of the dead band module are Generating a...

Page 51: ...MODE bits These bits determine if the falling edge delay rising edge delay neither or both are applied to the input signals Polarity Control The polarity control DBCTL POLSEL allows you to specify whe...

Page 52: ...gh No Delay X X 0 0 2 Active High Complementary AHC 1 0 1 1 3 Active Low Complementary ALC 0 1 1 1 4 Active High AH 0 0 1 1 5 Active Low AL 1 1 1 1 EPWMxA Out EPWMxA In No Delay 6 0 or 1 0 or 1 0 1 EP...

Page 53: ...w Complementary ALC Active High AH Active Low AL RED FED Period Dead Band Generator DB Submodule Figure 2 29 shows waveforms for typical cases where 0 duty 100 Figure 2 29 Dead Band Waveforms for Typi...

Page 54: ...venience delay values for various TBCLK options are shown in Table 2 14 Table 2 14 Dead Band Delay Values in S as a Function of DBFED and DBRED Dead Band Value Dead Band Delay in S 1 DBFED DBRED TBCLK...

Page 55: ...power switching elements The key functions of the PWM chopper submodule are Programmable chopping carrier frequency Programmable pulse width of first pulse Programmable duty cycle of second and subse...

Page 56: ...EPWMxA EPWMxB EPWMxA EPWMxA PWM Chopper PC Submodule Figure 2 31 PWM Chopper Submodule Operational Details Figure 2 32 shows simplified waveforms of the chopping action only one shot and duty cycle c...

Page 57: ...OUT and OSHTWTH is the four control bits value from 1 to 16 Figure 2 33 shows the first and subsequent sustaining pulses and Table 7 3 gives the possible pulse width values for a SYSCLKOUT 100 MHz Fig...

Page 58: ...subsequent pulses have been made programmable These sustaining pulses ensure the correct drive strength and polarity is maintained on the power switch gate during the on period and hence a programmabl...

Page 59: ...te external fault or trip conditions and the ePWM outputs can be programmed to respond accordingly when faults occur The key functions of the Trip Zone submodule are Trip inputs TZ1 to TZ6 can be flex...

Page 60: ...figured For more information see the GPIO section of the specific device version of the System Control and Interrupts Reference Guide listed in Section 1 Each TZn input can be individually configured...

Page 61: ...enables TZ1 as a one shot event source for ePWM2 TZCTL TZA 1 EPWM2A will be forced high on a trip event TZCTL TZB 1 EPWM2B will be forced high on a trip event Scenario B A cycle by cycle event on TZ5...

Page 62: ...4 TZ3 TZ2 TZ1 Trip logic Trip Trip CBC trip event OSHT trip event EPWMxA EPWMxB EPWMxA EPWMxB TZCTL TZB TZCTL TZA Async Trip Set Clear TZFLG CBC TZCLR CBC Set Clear TZFLG OST Trip Zone TZ Submodule Fi...

Page 63: ...submodule are Receives event inputs generated by the time base and counter compare submodules Uses the time base direction information for up down event qualification Uses prescaling logic to issue in...

Page 64: ...together and hence multiple modules can initiate an ADC start of conversion If two requests occur on one start of conversion line then only one will be recognized by the ADC Figure 2 39 Event Trigger...

Page 65: ...r via software ETFRC These bits allow software forcing of an event Useful for debugging or s w intervention A more detailed look at how the various register bits interact with the Interrupt and ADC st...

Page 66: ...ared This allows for one interrupt to be pending while one is serviced Writing to the INTPRD bits will automatically clear the counter INTCNT 0 and the counter output will be reset so no interrupts ar...

Page 67: ...BCNT ETPS SOCBPRD ETCLR SOCB SOCB ETFRC SOCB ETSEL SOCBEN ETFLG SOCB ETSEL SOCBSEL 000 001 010 011 100 101 111 101 0 0 CTRU CMPA CTRD CMPA CTRU CMPB CTRD CMPB CTR Zero CTR PRD Event Trigger ET Submodu...

Page 68: ...ePWM Submodules 68 SPRU791D November 2004 Revised October 2007 Submit Documentation Feedback...

Page 69: ...Multiple Buck Converters With Independent Frequencies 71 3 4 Controlling Multiple Buck Converters With Same Frequencies 75 3 5 Controlling Multiple Half H Bridge HHB Converters 78 3 6 Controlling Dua...

Page 70: ...be enable switch open Sync flow through SyncOut connected to SyncIn Master mode provides a sync at PWM boundaries SyncOut connected to CTR PRD Master mode provides a sync at any programmable point in...

Page 71: ...e ePWM module configured as a master can control two buck stages with the same PWM frequency If independent frequency control is required for each buck converter then one ePWM module must be allocated...

Page 72: ...X EPWM4B Phase reg Master4 En EPWM4A 3 X Buck 1 Vout1 Vin1 EPWM1A Buck 2 Vin2 EPWM2A Vout2 Buck 4 Buck 3 Vin3 EPWM4A Vin4 EPWM3A Vout3 Vout4 SyncIn SyncIn SyncIn Controlling Multiple Buck Converters...

Page 73: ...event triggers an interrupt CB A I P I P I P I Indicates this event triggers an ADC start of conversion Controlling Multiple Buck Converters With Independent Frequencies Figure 3 4 Buck Waveforms for...

Page 74: ...SHADOW EPwm2Regs TBCTL bit SYNCOSEL TB_SYNC_DISABLE EPwm2Regs CMPCTL bit SHDWAMODE CC_SHADOW EPwm2Regs CMPCTL bit SHDWBMODE CC_SHADOW EPwm2Regs CMPCTL bit LOADAMODE CC_CTR_ZERO load on CTR Zero EPwm2R...

Page 75: ...rolling Multiple Buck Converters With Same Frequencies If synchronization is a requirement ePWM module 2 can be configured as a slave and can operate at integer multiple N frequencies of module 1 The...

Page 76: ...CA Z I Z I A P CA CA CB CB CB CB CA CA CA CA CB CB CB CB Controlling Multiple Buck Converters With Same Frequencies Figure 3 6 Buck Waveforms for Figure 3 5 Note FPWM2 FPWM1 76 Applications to Power...

Page 77: ...e 2 config EPwm2Regs TBPRD 600 Period 1200 TBCLK counts EPwm2Regs TBPHS 0 Set Phase register to zero EPwm2Regs TBCTL bit CTRMODE TB_COUNT_UPDOWN Symmetrical mode EPwm2Regs TBCTL bit PHSEN TB_ENABLE Sl...

Page 78: ...e with a single ePWM module This control can be extended to multiple stages Figure 3 7 shows control of two synchronized Half H bridge stages where stage 2 can operate at integer multiple N frequencie...

Page 79: ...A CB CA Z Z A CB CA Pulse Center Z A CB CA A CB CA Z A CB CA Z A CB Z CA A CB Z CA Controlling Multiple Half H Bridge HHB Converters Figure 3 8 Half H Bridge Waveforms for Figure 3 7 Note Here FPWM2 F...

Page 80: ...DOW EPwm2Regs CMPCTL bit LOADAMODE CC_CTR_ZERO load on CTR Zero EPwm2Regs CMPCTL bit LOADBMODE CC_CTR_ZERO load on CTR Zero EPwm2Regs AQCTLA bit ZRO AQ_SET set actions for EPWM1A EPwm2Regs AQCTLA bit...

Page 81: ...CMPB Phase reg 3 Slave SyncOut X En EPWM3B EPWM3A Phase reg CTR CMPB CTR zero 4 Slave SyncOut X EPWM4A EPWM4B En SyncOut CTR zero CTR CMPB Phase reg Phase reg CTR CMPB CTR zero Slave 6 5 Slave X En Sy...

Page 82: ...00 700 700 Z I A P CA CA Z I A P CA CA CA CA CA CA CA CA CA CA Controlling Dual 3 Phase Inverters for Motors ACI and PMSM Figure 3 10 3 Phase Inverter Waveforms for Figure 3 9 Only One Inverter Shown...

Page 83: ...CC_SHADOW EPwm2Regs CMPCTL bit LOADAMODE CC_CTR_ZERO load on CTR Zero EPwm2Regs CMPCTL bit LOADBMODE CC_CTR_ZERO load on CTR Zero EPwm2Regs AQCTLA bit CAU AQ_SET set actions for EPWM2A EPwm2Regs AQCT...

Page 84: ...orrect operation As described in the TB module section a PWM module can be configured to allow a SyncIn pulse to cause the TBPHS register to be loaded into the TBCTR register To illustrate this concep...

Page 85: ...slave TBPHS registers 2 and 3 with values of 1 3 and 2 3 of the period value respectively For example if the period register is loaded with a value of 600 counts then TBPHS slave 2 200 and TBPHS slav...

Page 86: ...cIn SyncIn EPWM1B CTR zero CTR CMPB SyncOut X EPWM3B Phase reg Slave En SyncIn EPWM3A 1 2 3 VIN EPWM2B EPWM2A EPWM3A EPWM3B VOUT 0 120 120 240 Controlling a 3 Phase Interleaved DC DC Converter Figure...

Page 87: ...M3A EPWM3B 2 120 2 120 Z I Z I Z I Z I Z I A P CA CA A P CA CA A P CA CA Controlling a 3 Phase Interleaved DC DC Converter Figure 3 14 3 Phase Interleaved DC DC Converter Waveforms for Figure 3 13 SPR...

Page 88: ...ADOW EPwm2Regs CMPCTL bit LOADAMODE CC_CTR_ZERO load on CTR Zero EPwm2Regs CMPCTL bit LOADBMODE CC_CTR_ZERO load on CTR Zero EPwm2Regs AQCTLA bit CAU AQ_SET set actions for EPWM2A EPwm2Regs AQCTLA bit...

Page 89: ...ase shifted full bridge or zero voltage switched full bridge Here the controlled parameter is not duty cycle this is kept constant at approximately 50 percent instead it is the phase relationship betw...

Page 90: ...0 1200 FED ZVS transition ZVS transition Z CA Z I Z I Z I Z CB A CA CB A Z Z CB A CA Z Z CB A CA Controlling Zero Voltage Switched Full Bridge ZVSFB Converter Figure 3 16 ZVS Full H Bridge Waveforms 9...

Page 91: ...A 600 Set 50 fixed duty EPWM2A EPwm2Regs TBPHS 0 Set Phase register to zero initially EPwm2Regs TBCTL bit CTRMODE TB_COUNT_UP Asymmetrical mode EPwm2Regs TBCTL bit PHSEN TB_ENABLE Slave module EPwm2Re...

Page 92: ...Applications to Power Topologies 92 SPRU791D November 2004 Revised October 2007 Submit Documentation Feedback...

Page 93: ...nter Compare Submodule Registers 97 4 3 Action Qualifier Submodule Registers 99 4 4 Dead Band Submodule Registers 103 4 5 PWM Chopper Submodule Control Register 105 4 6 Trip Zone Submodule Control and...

Page 94: ...e Register TBPHS 15 0 TBPHS R W 0 LEGEND R W Read Write R Read only n value after reset Table 4 2 Time Base Phase Register TBPHS Field Descriptions Bits Name Value Description 15 0 TBPHS 0000 These bi...

Page 95: ...nly used when the time base counter is configured in the up down count mode The PHSDIR bit indicates the direction the time base counter TBCTR will count after a synchronization event occurs and a new...

Page 96: ...l to zero A write or read to the TBPRD register accesses the shadow register 1 Load the TBPRD register immediately without using a shadow register A write or read to the TBPRD register directly access...

Page 97: ...Input Synchronization Latched Status Bit 0 Writing a 0 will have no effect Reading a 0 indicates no external synchronization event has occurred 1 Reading a 1 on this bit indicates that an external syn...

Page 98: ...e same memory map address Figure 4 7 Counter Compare B Register CMPB 15 0 CMPB R W 0 LEGEND R W Read Write R Read only n value after reset Table 4 7 Counter Compare B Register CMPB Field Descriptions...

Page 99: ...Operates as a double buffer All writes via the CPU access the shadow register 1 Immediate mode Only the active compare B register is used All writes and reads directly access the active register for i...

Page 100: ...ng 00 Do nothing action disabled 01 Clear force EPWMxA output low 10 Set force EPWMxA output high 11 Toggle EPWMxA output low output signal will be forced high and a high signal will be forced low 5 4...

Page 101: ...nothing action disabled 01 Clear force EPWMxB output low 10 Set force EPWMxB output high 11 Toggle EPWMxB output low output signal will be forced high and a high signal will be forced low 5 4 CAU Act...

Page 102: ...is initiated This is a one shot forced event It can be overridden by another subsequent event on output B 1 Initiates a single s w forced event 4 3 ACTSFB Action when One Time Software Force B Is invo...

Page 103: ...orcing is disabled and has no effect 1 0 CSFA Continuous Software Force on Output A In immediate mode a continuous force takes effect on the next TBCLK edge In shadow mode a continuous force takes eff...

Page 104: ...DE 1 1 and DBCTL IN_MODE 0 0 Other enhanced modes are also possible but not regarded as typical usage modes 00 Active high AH mode Neither EPWMxA nor EPWMxB is inverted default 01 Active low complemen...

Page 105: ...0 7 0 DEL R W 0 LEGEND R W Read Write R Read only n value after reset Table 4 15 Dead Band Generator Falling Edge Delay Register DBFED Field Descriptions Bits Name Description 15 10 Reserved Reserved...

Page 106: ...T 0001 2 x SYSCLKOUT 8 wide 160 nS at 100 MHz SYSCLKOUT 0010 3 x SYSCLKOUT 8 wide 240 nS at 100 MHz SYSCLKOUT 0011 4 x SYSCLKOUT 8 wide 320 nS at 100 MHz SYSCLKOUT 0100 5 x SYSCLKOUT 8 wide 400 nS at...

Page 107: ...M module 10 OSHT3 Trip zone 3 TZ3 Select 0 Disable TZ3 as a one shot trip source for this ePWM module 1 Enable TZ3 as a one shot trip source for this ePWM module 9 OSHT2 Trip zone 2 TZ2 Select 0 Disab...

Page 108: ...zone pins can cause an event is defined in the TZSEL register Table 4 17 00 High impedance EPWMxB High impedance state 01 Force EPWMxB to a high state 10 Force EPWMxB to a low state 11 Do nothing no...

Page 109: ...egister Table 4 21 1 CBC Latched Status Flag for Cycle By Cycle Trip Event 0 No cycle by cycle trip event has occurred 1 Indicates a trip event has occurred on a pin selected as a cycle by cycle trip...

Page 110: ...is cleared If the TZFLG INT bit is cleared and any of the other flag bits are set then another interrupt pulse will be generated Clearing all flag bits will prevent further interrupts Figure 4 22 Trip...

Page 111: ...decrementing 110 Enable event time base counter equal to CMPB when the timer is incrementing 111 Enable event time base counter equal to CMPB when the timer is decrementing 11 SOCAEN Enable the ADC St...

Page 112: ...Counter Register These bits indicate how many selected ETSEL SOCBSEL events have occurred 00 No events have occurred 01 1 event has occurred 10 2 events have occurred 11 3 events have occurred 13 12 S...

Page 113: ...s occurred 10 2 events have occurred 11 3 events have occurred 1 0 INTPRD ePWM Interrupt EPWMx_INT Period Select These bits determine how many selected ETSEL INTSEL events need to occur before an inte...

Page 114: ...her interrupts will be generated until the flag bit is cleared Up to one interrupt can be pending while the ETFLG INT bit is still set If an interrupt is pending it will not be generated until after t...

Page 115: ...5 4 Reserved Reserved 3 SOCB SOCB Force Bit The SOCB pulse will only be generated if the event is enabled in the ETSEL register The ETFLG SOCB flag bit will be set regardless 0 Has no effect Always re...

Page 116: ...Registers 116 SPRU791D November 2004 Revised October 2007 Submit Documentation Feedback...

Page 117: ...ified figure Figure 2 25 Modified figure Figure 2 26 Modified figure Section 2 6 3 Corrected register name from CHPCTL to PCCTL in the first paragraph of the section on operational highlights for the...

Page 118: ...r Rising Edge Delay Register Reserved field Table 4 15 Modified the bit numbers of the Dead Band Generator Falling Edge Delay Register Reserved field Section 2 8 1 Updated description of event counter...

Page 119: ...ce and is an unfair and deceptive business practice TI is not responsible or liable for any such statements TI products are not authorized for use in safety critical applications such as life support...

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